Sodium hydrosulfide is a chemical compound that is represented using the formula NaHS. Sodium hydrosulfide is colorless or yellow crystals. The compound has a melting point at 350oC. Sodium hydrosulfide is readily soluble in alcohol and water. Sodium hydrosulfide has a molecular mass of 56.6. The aqueous solution of sodium hydrosulfide usually has alkaline reactions. Sodium hydrosulfide is a compound that is formed by neutralizing hydrogen sulfide with sodium hydroxide. Sodium hydrosulfide is an essential reagent that is used for the synthesis of inorganic and organic sulfur compound. Sodium hydrosulfide is solid in nature; however, it is often used as an aqueous solution. Solid sodium hydrosulfide is highly hygroscopic in nature. However, sodium hydrosulfide is more stable in solutions as they get slowly oxidized in air. Sodium hydrosulfide when in solid state is colorless and smells like that of hydrogen sulfide due to its hydrolysis by moisture present in the atmosphere. In contrast, to that of sodium sulfide, which is insoluble in organic solvents sodium hydrosulfide, is highly soluble in organic solvents. Sodium hydrosulfide in its crystalline form undergoes two phase transitions. Sodium hydrosulfide adopts sodium chloride structure at temperature above 300K. Sodium hydrosulfide liberates hydrogen sulfide when heated under the action of acids which act as reducing agents. Sodium hydrosulfide is synthesized in the laboratory by treating sodium methoxide with hydrogen sulfide. Sodium hydrosulfide is unique alkaline product that has a wide range of industrial applications.

Sodium hydrosulfide finds various applications in wide range of industries. Sodium hydrosulfide is used mainly in the leather industry. The compound is extremely essential for the removal of hair from the animal hides. Sodium hydrosulfide is also used in the paper and pulp industry. Hydrogen sulfide helps in degrading the lignin structures present in the raw materials such as wood. Thus, growing paper and pulp industry is expected to boost the overall demand for the sodium hydrosulfide market. Sodium hydrosulfide is also used in the kraft processes. Sodium hydrosulfide also finds applications as a flotation agent in the mining industry. Sodium hydrosulfide is used in copper mining wherein it is used to activate mineral oxide species. Thus, the growing mining activities are expected to fuel the overall growth of the sodium hydrosulfide market. Toxic effects of sodium hydrosulfide are expected to hamper the growth of the market in the near future.

Asia Pacific is expected to be the largest consumer of sodium hydrosulfide market. The presence of large number of secondary processed product industries such as leather, paper and pulp, textiles among others is expected to augment the overall growth of the market in the near future. The overall consumption of sodium hydrosulfide has declined in the North America. Increase in restrictions on the use of toxic products has led to the reduction in the overall consumption of sodium hydrosulfide in the developed countries.

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